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Functions
- #arg
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- [a1,...an]
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- E()
- E()
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- end s
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- o()
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- ones()
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- pseudo()
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- Qconnect()
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- query()
- r.(x,...)
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- second()
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- sort()
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- spark_open()
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- spearman()
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- split()
- splserver()
- sqlparse()
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- T()
- tarcorskew()
- tan()
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- time()
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- to()
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- true
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- zeros()
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- Intersection of sequences
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splinemthd()
Description:
Get cubic spline interpolation.
Syntax:
splinemthd(x,y,newx)
Note:
x,y are a coordinate vector of an existing point, and newx is a query point vector. The function returns the interpolation vector corresponding to the query point specified by newx; the vector’s value is determined by x and y’s cubic spline interpolation values.
Parameter requirements:
1. The range of newx must not exceed the original boundaries of x;
2. x should be strictly monotonic increasing, but no requirements for y; x and y should have same length;
3. Null values and infinite values are not allowed.
Parameter:
|
x/y/newx |
A one-dimensional sequence |
Return value:
Sequence
Example:
|
|
A |
|
|
1 |
=[1.0,3.0,4.0,8.0,12.0] |
|
|
2 |
=[3.0,5.0,7.0,15.0,21.0] |
|
|
3 |
=[2.0,5.0,7.0,9.0,10.0] |
|
|
4 |
=splinemthd(A1,A2,A3) |
|
